LIMIT SWITCHES & POSITION INDICATION

Engineering Creative Solutions for Fluid Systems Since 1901

2 I Pratt Industrial

TECHNOPOLYMER LIMIT SWITCH

QUICK SET CAMSThe operating position of the switches can be easily changed by manually adjusting the high-resolution spline cams. The cams are spring backed and will not be affected by normal vibration.

EASY WIRINGDespite its compact design, Pratt Industrial switchboxes are easy to wire up with plenty of room to bring wires into the enclosure. As standard, each unit has two 1/2” NPT conduit entries, and a terminal strip which is angled to allow for ease in attaching external wires.

COMPACT DESIGNPratt Industrial switch box has a compactconstruction, minimizing valve package envelope size.

HIGH VISIBILITY INDICATOROur high-visibility indicator offers clear location of the current valve position.

VERSIONSOffered with two mechanical micro switches or different types of proximity sensors.

INCLUSIVE MOUNTING BRACKETA technopolymer mounting bracket is supplied as standard and fits NAMUR top-mounting hole spacing 80mm x 30mm. The bracket allows the use of standard NAMUR stem height of 30mm, and 20mm with a coupling included in the standard kit.

Please call for further details.

DESCRIPTIONThe Pratt Industrial MS41-2 Limit Switch Box represents a new dimension in position indication for rotaryactuators. Manufactured completely in technopolymer with stainless steel fasteners and NEMA 4/4x rating, these products are corrosion resistant and suitable for the most corrosive environments.

FEATURES

CSA approved to Classes 3211 06 and 3211 86 for Industrial Controls Equipment. Testing conducted according to the applicable sections of CAN/CSA C22/2. ANSI/UL 508 and ANSI/UL 50.

Standard Mount

Direct Mount

Technopolymer:Excellence in Anti-Corrosion

Pratt Industrial I 3

Switch #1 Up-Open

Switch #2Under-Closed

Solenoid ValvePass Thru

WIRING DIAGRAM

SPDT MECHANICAL SWITCHES with 8-Point Terminal Strip on a printed circuit board.

MATERIAL

ELECTRICAL RATINGContact Arrangement: SPDT (Form C)

TECHNICAL DATA

INDUCTIVE PROXIMITY SENSORS

Operating Force 0.60 N (61 Gram Max)

Release Force 0.06 N (6 Gram Max)

Differential Travel .189 in

Over-travel .032 in

Rated Voltage Resistive Load

Inductive Load

125 VAC 5 Amp 3 Amp

250 VAC 3 Amp 2 Amp8 VDC 5 Amp 5 Amp

14 VDC 5 Amp 4 Amp30 VDC 4 Amp 3 Amp

125 VDC 0.4 Amp 0.4 Amp250 VDC 0.2 Amp 0.2 Amp

Item Material

Box Technopolymer

Brackets Technopolymer

Position Indicator Technopolymer

Fasteners Stainless Steel

Seals BUNA-N

Operating Shafts Technopolymer

Cams Technopolymer

Microswitches Technopolymer

Electrical Board w/Clamps

PolyamideNormal voltage [v] 8

Current consumption N/A

Sensing face covered [mA] 1

Sensing face free [mA] 3

Switching frequency [Hz] 1000

Self inductance [mH] 50

Self capacitance [nF] 35

Protection IP65/NEMA 4/4x

Operating Temp. [̊ F] -13̊ to 212˚

TECHNOPOLYMER LIMIT SWITCH OPTIONS

4 I Pratt Industrial

InductiveProximityMechanical Magnetic

Proximity

DESCRIPTIONThe Pratt Industrial aluminum and stainlesssteel limit switch box is setting a new standard for compact limit switches. The aluminum and stainless steel limit switch is available with mechanical, proximity, and inductive switches. These options allow for a low cost switch based on the needs and wants of the particular application.

FEATURESQUICK SET CAMSThe operating position of the switches can be easily changed by adjusting the high-resolution spline cams manually and independently without the need for additional tools. The cams are spring-backed and will not be affected by normal vibration.

COMPACT DESIGNPratt Industrial switch box has a compact construction,minimizing valve package envelope size.

EASY WIRINGMS45 & PS45 Series are equipped as standard with two conduit entries 1/2” NPT and one 8-point angled terminal strip to allow for easy wiring.

HIGH VISIBILITY INDICATORThe MS45 & PS45 Series comes standard with a high- visibility beacon, offering clear location of the current valve position.

CAPTIVE COVER BOLTSThe switch box also comes standard with stainless steel captive cover bolts.

INCLUSIVE MOUNTING BRACKETNAMUR 80mm x 30mm H30 stainless steel bracket supplied as standard with stainless steel fastening hardware for ease in mounting the switch box onto the actuator. MS45 & PS45 Series can be mounted on NAMUR H20 actuators through a technopolymer coupling.

Please call for further details.

Switch #1 Up-Open

Switch #2Under-Closed

Solenoid ValvePass Thru

WIRING DIAGRAM

Available inStainless Steel

ALUMINUM/STAINLESS STEEL LIMIT SWITCH

Universal 303SS Mounting Bracket

Specification Standard Option

Enclosure Protection IP67/NEMA 4/4x Intrinsically Safe EEx ia iIC T6

Temperature Range -4°F+176°F(-20°C~+80°C)

-40°F+185°F(-40°C +85°C)

Conduit Entries 2x 1/2” NPT 2x M20x1,5

Switches2x Mechanical Switches SPDT

2x Proximity Sensors2x Magnetic Switches

Gold plated contacts

Terminal 8-Points 9-Points

External Coating Black Epoxy Coating orElectroPolished SS

Call for options

Weight Aluminum: 1.76 lbs Stainless Steel: 3.80 lbs

TECHNICAL SPECIFICATIONS

Mechanical Switches 3A @ 250 VAC

Proximity Sensors See ordering information

Magnetic Switches See ordering information

ELECTRICAL RATING

Solenoid Valve Pass-Thru Option

Item Material

Housing Die Cast AluminiumAISI 316 Stainless Steel

ShaftAISI 304 Stainless Steel

(for All LSB)AISI 316 Stainless Steel

(for SS LSB)

External Indicator

Polycarbonate

Indicator OPEN/CLOSED

ABS

Cams ABS

Spring Stainless Steel

O Ring BUNA-N

Bracket AISI 300 Series Stainless Steel

ALUMINUM/SS LIMIT SWITCH OPTIONS MATERIAL

Pratt Industrial I 5

FEATURESMULTIPLE CAPABILITIESIntegral 3-position dual-coil blocked-center or specially configured 3 -position dual-coil exhaust-center solenoid valves suitable for both double-acting and spring-return applications.

MID-POINT STOPIdeal for all 180° spring-return 3-position control applications where a mid-point stop is required including the need for a critical failure position (i.e. 180° dribble control application with failure back to the 0° starting position).

COMPACT DESIGNReduction of components and significant installation, calibration, and testing time.

DRIBBLEThe mid-point (or dribble) position can be reached from either direction.

SIMPLIFIED CONTROLSolenoid valves and feedback sensors are pre-wired and jumpered to a printed circuit board assembly for simplified control and monitoring of valve position.

NO BRACKETNo bracket is required for actuators conforming to the ISO NAMUR standard.

Please call for further details.

3-POSITION CONTROL LIMIT SWITCHThe MS44HU control unit is now available with 3-position control options with configurations for double-acting and spring-return actuators (for both 90°, 180°, and other rotational requirements). It features an integral 3-position, dual-coil solenoid valve for actuator control combined with feedback sensors for CW, mid-point or dribble-position, and CCW position indication in a single compact enclosure.

Body & Cover Epoxy Coated Aluminum

IndicatorDome

UV Resistant and VO Polycarbonate

Pneumatic Connection

PlateAnodized Aluminum

Seals ABS

Shaft Stainless Steel

Fastners Stainless Steel

MATERIALS

Ambient Temperature

Range

General Purpose:23˚F to 122˚F

Intrinsically Safe:-4˚F to 140˚F

FluidFiltered, lubricated, or

non-lubricated compressed air (dried DP -4˚F)

Operating Pressure Min. 37 psi, Max. 116 psi

Electrical according to switch option

SWITCH RATINGS

Advanced Valve Control

OMEGA

6 I Pratt Industrial

ACTUATOR BEACONSPratt Industrial rack and pinion pneumaticactuators offer many types of visual indicators. These various types of indicators make it easy for visual indication for the current position of the actuator.

The standard high visibility indicator is an open/closed configuration for easy visual indication of the actuator.

Also offered is a red and green indicator which shows position with easy to see colors.

For multiport applications Pratt Industrial offers ahighly visible yellow and black indicator. This option distinctly shows the correct flow path in a multiport application.

LIMIT SWITCH BEACONSPratt Industrial limit switch boxes offer many typesof visual indicators. These various types make it easy for visual indication for the current position of the valve assembly.

Each limit switch comes standard with an open/closed indicator which is easily read for visual indication.

Also offered is an arrow indicator. This accurately shows whether the valve assembly is open, closed, or in current throttled position.

For multiport applications, Pratt Industrialoffers a highly visible yellow and black indicator. This option distinctly shows the correct flow path in multiport applications.

L-Port

T-Port

BEACONS

Note: Yellow and black inserts are interchangeable.

Pratt Industrial I 7

www.prattindl.com620-208-8100

UNIVERSAL BRACKETStainless Steel (303) adjustable NAMUR bracket makes assembly onto any NAMUR actuator easy. This allows for ease of installation considering the four different NAMUR options.

SS BRACKETSPratt Industrial 304 stainless steel ISObrackets come in many combinations. These brackets are made of 304 stainless steel and are very compact, sturdy, and cost-effective.

Plug Options

OPTIONS & ACCESSORIES

8 I Pratt Industrial

Pratt IndustrialEmporia, Kansas

Tel. 620-208-8100Fax. 620-208-8111www.prattindl.com

© 2014 CAM Valve and Automation, LLC I Printed in the U.S.A. I PI-LS-1014